Mercurial > gemma
annotate pkg/wfs/download.go @ 2294:b2de7a77b570
import soundingresult: fix URL
author | Thomas Junk <thomas.junk@intevation.de> |
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date | Mon, 18 Feb 2019 11:11:12 +0100 |
parents | 8a6ed058af22 |
children | a8ebc785823d |
rev | line source |
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1 // This is Free Software under GNU Affero General Public License v >= 3.0.Reader. |
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2 // without warranty, see README.md and license for details. |
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3 // |
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4 // SPDX-License-Identifier: AGPL-3.0-or-later |
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5 // License-Filename: LICENSES/AGPL-3.0.txt |
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6 // |
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7 // Copyright (C) 2018 by via donau |
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH |
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9 // Software engineering by Intevation GmbH |
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10 // |
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11 // Author(s): |
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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13 |
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14 package wfs |
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15 |
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16 import ( |
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17 "bufio" |
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18 "bytes" |
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19 "encoding/xml" |
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20 "errors" |
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21 "fmt" |
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22 "io" |
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23 "log" |
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24 "net/http" |
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25 "net/url" |
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26 "strconv" |
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27 "strings" |
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28 |
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29 "gemma.intevation.de/gemma/pkg/config" |
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30 "golang.org/x/net/html/charset" |
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31 ) |
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32 |
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33 var ( |
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34 // ErrNoSuchFeatureType is returned when a feature is not supported. |
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35 ErrNoSuchFeatureType = errors.New("No such feature type") |
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36 // ErrGetFeatureNotSupported is returned when GetFeature is not supported. |
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37 ErrGetFeatureNotSupported = errors.New("GetFeature not supported") |
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38 // ErrMethodGetNotSupported is returned when the GET is not supported. |
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39 ErrMethodGetNotSupported = errors.New("GET not supported") |
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40 // ErrNoNumberMatchedFound is returned if feature count cannot be extracted. |
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41 ErrNoNumberMatchedFound = errors.New("No numberMatched attribute found") |
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42 // ErrOutputFormatNotSupported is returned if a output format is |
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43 // not supported. |
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44 ErrOutputFormatNotSupported = errors.New("Output format not supported") |
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45 ) |
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46 |
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47 // GetCapabilities downloads a capabilities document for a given URL. |
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48 func GetCapabilities(capURL string) (*Capabilities, error) { |
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49 |
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50 base, err := url.Parse(capURL) |
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51 if err != nil { |
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52 return nil, err |
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53 } |
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54 v := url.Values{} |
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55 v.Set("SERVICE", "WFS") |
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56 v.Set("REQUEST", "GetCapabilities") |
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57 v.Set("ACCEPTVERSIONS", "2.0.0,1.1.0,1.0.0") |
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58 base.RawQuery = v.Encode() |
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59 |
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60 baseURL := base.String() |
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61 resp, err := http.Get(baseURL) |
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62 if err != nil { |
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63 return nil, err |
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64 } |
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65 defer resp.Body.Close() |
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66 caps, err := ParseCapabilities(bufio.NewReader(resp.Body)) |
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67 if err == nil { |
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68 caps.BaseURL = baseURL |
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69 } |
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70 return caps, err |
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71 } |
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72 |
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73 func numberFeaturesGET(u *url.URL, featureType, version string) (int, error) { |
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74 |
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75 v := url.Values{} |
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76 v.Set("SERVICE", "WFS") |
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77 v.Set("REQUEST", "GetFeature") |
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78 v.Set("resultType", "hits") |
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79 v.Set("VERSION", version) |
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80 v.Set("TYPENAMES", featureType) |
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81 |
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82 q := *u |
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83 q.RawQuery = v.Encode() |
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84 |
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85 resp, err := http.Get(q.String()) |
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86 if err != nil { |
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87 return 0, err |
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88 } |
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89 defer resp.Body.Close() |
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90 dec := xml.NewDecoder(resp.Body) |
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91 dec.CharsetReader = charset.NewReaderLabel |
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92 |
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93 var result struct { |
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94 NumberMatched *int `xml:"numberMatched,attr"` |
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95 } |
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96 |
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97 if err := dec.Decode(&result); err != nil { |
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98 return 0, err |
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99 } |
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100 |
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101 if result.NumberMatched == nil { |
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102 return 0, ErrNoNumberMatchedFound |
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103 } |
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104 |
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105 return *result.NumberMatched, nil |
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106 } |
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107 |
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108 // GetFeaturesGET constructs a list of URLs to get features |
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109 // for a given feature type from a WFS servers. |
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110 func GetFeaturesGET( |
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111 caps *Capabilities, |
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112 featureTypeName, |
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113 outputFormat string, |
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114 sortBy string, |
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115 ) ([]string, error) { |
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116 |
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117 feature := caps.FindFeatureType(featureTypeName) |
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118 if feature == nil { |
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119 return nil, ErrNoSuchFeatureType |
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120 } |
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121 op := caps.FindOperation("GetFeature") |
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122 if op == nil { |
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123 return nil, ErrGetFeatureNotSupported |
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124 } |
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125 |
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126 if op.DCP.HTTP.Get == nil { |
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127 return nil, ErrMethodGetNotSupported |
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128 } |
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129 |
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130 getRaw := op.DCP.HTTP.Get.HRef |
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131 getU, err := url.Parse(getRaw) |
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132 if err != nil { |
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133 return nil, err |
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134 } |
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135 // The URL could be relative so resolve against Capabilities URL. |
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136 if !getU.IsAbs() { |
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137 base, err := url.Parse(caps.BaseURL) |
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138 if err != nil { |
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139 return nil, err |
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140 } |
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141 getU = getU.ResolveReference(base) |
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142 } |
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143 |
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144 if !op.SupportsOutputFormat(outputFormat) { |
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145 return nil, ErrOutputFormatNotSupported |
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146 } |
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147 |
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148 wfsVersion := caps.HighestWFSVersion(WFS200) |
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149 |
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150 featuresPerPage, supportsPaging := op.FeaturesPerPage() |
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151 |
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152 var numFeatures int |
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153 |
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154 if supportsPaging { |
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155 log.Printf("info: Paging supported with %d feature per page.\n", |
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156 featuresPerPage) |
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157 |
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158 if !op.SupportsHits() { |
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159 supportsPaging = false |
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160 } else { |
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161 numFeatures, err = numberFeaturesGET(getU, featureTypeName, wfsVersion) |
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162 if err != nil { |
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163 log.Printf("error: %v\n", err) |
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164 supportsPaging = false |
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165 } else { |
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166 log.Printf("info: Number of features: %d\n", numFeatures) |
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167 } |
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168 } |
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169 } |
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170 |
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171 var downloadURLs []string |
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172 wfs2 := !versionIsLess(wfsVersion, WFS200) |
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173 |
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174 addNS := func(v url.Values) { |
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175 if len(feature.Namespaces) == 0 { |
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176 return |
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177 } |
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178 // Only use first namespace |
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179 ns := feature.Namespaces[0] |
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180 if wfs2 { |
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181 v.Set("NAMESPACES", fmt.Sprintf("(%s,%s)", ns.Space, ns.Local)) |
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182 } else { |
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183 v.Set("NAMESPACE", fmt.Sprintf("(%s:%s)", ns.Space, ns.Local)) |
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184 } |
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185 } |
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186 |
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187 addOutputFormat := func(v url.Values) { |
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188 if outputFormat != "" { |
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189 v.Set("outputFormat", outputFormat) |
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190 } |
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191 } |
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192 |
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193 addSortBy := func(v url.Values) { |
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194 if sortBy != "" { |
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195 v.Set("sortBy", sortBy) |
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196 } |
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197 } |
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198 |
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199 if supportsPaging { |
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200 pagedURL := func(ofs, count int) string { |
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201 v := url.Values{} |
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202 v.Set("SERVICE", "WFS") |
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203 v.Set("REQUEST", "GetFeature") |
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204 v.Set("VERSION", wfsVersion) |
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205 v.Set("startIndex", strconv.Itoa(ofs)) |
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206 if wfs2 { |
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207 v.Set("count", strconv.Itoa(count)) |
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208 } else { |
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209 v.Set("maxFeatures", strconv.Itoa(count)) |
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210 } |
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211 v.Set("TYPENAMES", featureTypeName) |
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212 addNS(v) |
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213 addOutputFormat(v) |
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214 addSortBy(v) |
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215 q := *getU |
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216 q.RawQuery = v.Encode() |
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217 return q.String() |
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218 } |
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219 if numFeatures <= featuresPerPage { |
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220 log.Println("info: All features can be fetched in one page.") |
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221 downloadURLs = []string{pagedURL(0, numFeatures)} |
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222 } else { |
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223 log.Println("info: Features need to be downloaded in pages.") |
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224 for pos := 0; pos < numFeatures; { |
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225 var count int |
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226 if rest := numFeatures - pos; rest >= numFeatures { |
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227 count = numFeatures |
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228 } else { |
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229 count = rest |
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230 } |
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231 downloadURLs = append(downloadURLs, pagedURL(pos, count)) |
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232 pos += count |
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233 } |
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234 } |
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235 } else { // No paging support. |
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236 v := url.Values{} |
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237 v.Set("SERVICE", "WFS") |
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238 v.Set("REQUEST", "GetFeature") |
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239 v.Set("VERSION", wfsVersion) |
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240 v.Set("TYPENAMES", featureTypeName) |
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241 addNS(v) |
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242 addOutputFormat(v) |
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243 addSortBy(v) |
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244 q := *getU |
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245 q.RawQuery = v.Encode() |
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246 downloadURLs = []string{q.String()} |
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247 } |
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248 |
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249 return downloadURLs, nil |
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250 } |
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251 |
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252 func downloadURL(url string, handler func(string, io.Reader) error) error { |
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253 resp, err := http.Get(url) |
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254 if err != nil { |
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255 return err |
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256 } |
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257 if resp.StatusCode < 200 || resp.StatusCode > 299 { |
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258 return fmt.Errorf("Invalid HTTP status code: %d (%s)", |
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259 resp.StatusCode, resp.Status) |
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260 } |
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261 defer resp.Body.Close() |
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262 |
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263 var already bytes.Buffer |
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264 |
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265 // Prevent the XML reader from consuming everything. |
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266 limit := io.LimitReader(resp.Body, 16*1024) |
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267 in := io.TeeReader(limit, &already) |
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268 |
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269 if err := scanExceptionReport(in); err != nil { |
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270 return err |
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271 } |
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272 |
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273 multi := io.MultiReader(bytes.NewReader(already.Bytes()), resp.Body) |
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274 return handler(url, multi) |
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275 } |
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276 |
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277 type ExceptionReport struct { |
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278 Code string |
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279 Text string |
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280 } |
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281 |
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282 func (er *ExceptionReport) Error() string { |
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283 return fmt.Sprintf( |
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284 "WFS GetFeature error: ExceptionCode: '%s' / ExceptionText: %s", |
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285 er.Code, er.Text) |
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286 } |
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287 |
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288 func scanExceptionReport(r io.Reader) *ExceptionReport { |
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289 |
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290 const ows = "http://www.opengis.net/ows/1.1" |
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291 |
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292 decoder := xml.NewDecoder(r) |
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293 decoder.CharsetReader = charset.NewReaderLabel |
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294 |
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295 var ( |
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296 isError bool |
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297 code string |
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298 depth int |
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299 text strings.Builder |
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300 ) |
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301 |
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302 type tokenFunc func(xml.Token) tokenFunc |
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303 |
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304 var exceptionReportFn, exceptionFn, exceptionTextFn, collectTextFn tokenFunc |
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305 |
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306 exceptionReportFn = func(t xml.Token) tokenFunc { |
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307 e, ok := t.(xml.StartElement) |
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308 if !ok { |
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309 return exceptionReportFn |
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310 } |
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311 if e.Name.Local != "ExceptionReport" && e.Name.Space != ows { |
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312 return nil |
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313 } |
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314 isError = true |
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315 return exceptionFn |
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316 } |
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317 |
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318 exceptionFn = func(t xml.Token) tokenFunc { |
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319 e, ok := t.(xml.StartElement) |
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320 if !ok { |
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321 return exceptionFn |
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322 } |
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323 if e.Name.Local == "Exception" && e.Name.Space == ows { |
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324 for i := range e.Attr { |
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325 at := &e.Attr[i] |
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326 if at.Name.Local == "code" || at.Name.Local == "exceptionCode" { |
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327 code = at.Value |
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328 break |
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329 } |
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330 } |
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331 return exceptionTextFn |
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332 } |
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333 return exceptionFn |
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334 } |
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335 |
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336 exceptionTextFn = func(t xml.Token) tokenFunc { |
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337 e, ok := t.(xml.StartElement) |
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338 if ok && e.Name.Local == "ExceptionText" && e.Name.Space == ows { |
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339 return collectTextFn |
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340 } |
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341 return exceptionTextFn |
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342 } |
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343 |
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344 collectTextFn = func(t xml.Token) tokenFunc { |
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345 switch e := t.(type) { |
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346 case xml.StartElement: |
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347 depth++ |
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348 case xml.CharData: |
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349 if depth == 0 { |
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350 text.Write(e) |
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351 } |
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352 case xml.EndElement: |
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353 if depth == 0 { |
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354 return nil |
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355 } |
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356 depth-- |
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357 } |
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358 return collectTextFn |
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359 } |
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360 |
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361 tokens: |
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362 for fn := exceptionReportFn; fn != nil; { |
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363 tok, err := decoder.Token() |
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364 switch { |
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365 case tok == nil && err == io.EOF: |
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366 break tokens |
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367 case err != nil: |
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368 return nil |
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369 } |
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370 fn = fn(tok) |
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371 } |
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372 |
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373 if isError { |
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374 return &ExceptionReport{ |
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375 Code: code, |
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376 Text: text.String(), |
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377 } |
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378 } |
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379 |
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380 return nil |
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381 } |
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382 |
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383 // DownloadURLs does the actual GetFeature requests downloads |
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384 // and hands the resulting io.Readers over to the given handler. |
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385 func DownloadURLs(urls []string, handler func(string, io.Reader) error) error { |
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386 config.WaitReady() |
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387 for _, url := range urls { |
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388 if err := downloadURL(url, handler); err != nil { |
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389 return err |
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390 } |
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391 } |
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392 return nil |
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393 } |